Pressure-gage.



I. QKILL.

PRESSURE- GAGE. APPLIOATIOI nun m a. 1911.

15042358. Patented 0%.29, 1912 I WITNESSES 1 ATTORNEYS JOHN-GRILL, ormore FERRY, midterm;

PRESSURE-GAGE.

Specification of Letters Patent.

Application flled May 8, 1

To all whom it may concern." 1

Be it known that I, JOHN OKILL, subject of the King of Great Britain,residing at 89 Highfield Grove, Rock Ferry, in the county of Cheshire,England, engineer, have invented certain new and usefuL Improve-'lnentsltelating to Pressure-Gages, of which the following is aspecification.

This invention relates to pressure gages,

and has for its object to construct a simple and convenient gagefor'measiu'ement of the maximum pressure attained in fluctuating orpulsating pressures such as are produced in the cylinders of internalcombustion engines.

In the accompanying sheet of explanatory drawings Figure 1 is a frontelevation with the front removed of a Bourdon pressure gage providedwith this invention. Fig. 2 is an end section of a portion of the indexeontrollin device.

The same reterence letters in the two views indicate the same parts. I

In the application of the invention to a Bourdon pressure gage, theusual curved tube a is connected at one end to the pres sure inlet I)and at the other end to the index 0 through the medium of a link 03. Itis evident that without. special means for controlling the index,rapidly fluctuating or pulsating pressures in the tube would cause suchoscillations of the index across the scale that it would be impossibleto read the maximum pressures attained.

ikccording to this invention one device for controlling theindexconsists, as shown in Figs. 1 and 2, .in the attach! lent tothe-free end of the tube a of a pair oi? links a hinged by a pin j atone end to the tube and at the other end to a nut f throughl whichpasses a screw 9. The latter is carried in the case it of the gage andprovided with .an external head or grip iece. At the junction of thelinks 6 with t e tube a a certain amount of' tree-movement of the tubeis permitted (by- PatentedOct.29,1912.

911. Serial No. 625,773.

means of a slot 6 in each link). To determine the maximum pressureattained in, for example, the cylinder of an internal com bust-lonengine, the gage :is put-into communication with the engine cylinder.The index then oscillates within the limits permittedby the slots 27. Onrotating the screw 9 the links e are gradually raised and the index 0caused to travel across its scale. So long as the index is below theposition of maximum pressure it will continue to oscillate, but as" soonas. it reaches the posi tion of maximum pressure the oscillationceasesand the required reading can then be taken.

Having thus described my invention what .I claim as new and desire tosecure by Letters Patent is 1. In pressure gages, the combination withaninclosing case and means forimparting movement to an index, of a nutand screw connected tothe case, a link situated between the nut andscrew and the said meanseonnections at the ends of the link to thenutand said means respectively, and a slot in the link at. one of saidconnections, substantially as described.

2. In pressure gages, the combination with a Bourdon tube, an indexconnected thereto, and an inclosing case, of a pair of slotted links, apin and slot device connecting the links to the free end of the tube, anut attached to the links, and a screw on gaging saidnut, said screwbeing mounted on the case and provided with an operating port-ionprojecting outside the case, substantially as described. V

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses. i

Joniif OKILL.

Witnesses: I

"* Hi1 Likenes 'JAtins 'FnAncIs

